The Two-Way

1:54 pm

Wed January 30, 2013

Mourners create a memorial at the fountain of the Aurora Municipal Center after a prayer vigil Sunday for the 12 victims of Friday's mass shooting at the Century 16 movie theater.

Kevork DjansezianGetty Images

Back in November, one of the Homeland Security's intelligence analysis centers in New Jersey was tasked with finding "commonalities" of mass shootings in the United States.

Today, the website Public Intelligence received an unclassified version of that report through a Freedom of Information Act request. The New Jersey "Fusion Center" looked at 29 mass shootings in the United States since 1999.

The findings:

-- Nearly half of the shootings happened at a workplace.

-- All but one of the shooters were male between the ages of 17 and 48.

-- All but one of the attacks were perpetrated by single shooters. The only exception were the "two students who conducted the shootings at Columbine."

-- Most of the "active shooters" committed suicide or were killed by responding officers.